Other
Quick Math: Numbers Percentages
This QuickMath activity changes percentages to decimals or fraction and vice versa. It also calculates a certain percent of a number or vice versa.
CK-12 Foundation
Ck 12: Chemistry: Calculating Atomic Mass
[Free Registration/Login may be required to access all resource tools.] Covers definition of atomic mass and calculations of atomic mass.
Calculator Soup
Calculator Soup: Percentage Calculator
Find a percentage or work out the percentage given numbers and percent values. Use percent formulas to figure out percentages and unknowns in equations. Add or subtract a percentage from a number or solve the equations.
University of Cambridge
University of Cambridge: Nrich: Put Out the Flags
Sharpen your logic and percent skills while working on this challenge. A strategy for solving the problem and the solution are available from links on the left.
Calculator Soup
Calculator Soup: Tip Calculator
Calculate a tip or gratuity and get the total amount to pay. Enter your meal or dinner cost along with the tip percentage. If you are splitting the cost at a restaurant among several people you can divide by the number of people to get...
Texas Education Agency
Texas Gateway: Ap Physics: 1.3 Accuracy, Precision, and Significant Figures
By the end of this section, you will be able to do the following: Determine the appropriate number of significant figures in both addition and subtraction, as well as multiplication and division calculations and Calculate the percent...
Mangahigh
Mangahigh: Number: Find One Amount as a Percent of Another No Calculator
When given a word problem determine the fraction.
Khan Academy
Khan Academy: Discount, Tax, and Tip Word Problems
Practice solving word problems involving price discounts, taxes, and tip calculations. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
BBC
Bbc: Ks3 Maths: Percentages
KS3 Math provides interactive activities on percentages, using pence and pounds. Use the factsheet for percentage information. You may use the worksheet for percentage practice and take the test provided to check your percentage skills....
Texas Instruments
Texas Instruments: Math Today for Ti: Is Leisure Time Really Shrinking
Students will to organize data from the USA TODAY Snapshot, "Is leisure time really shrinking?," into two scatter plots and determine the quadratic model for each scatter plot. Students will determine if these graphs intersect and learn...
Calculator Soup
Calculator Soup: Percent to Fraction Calculator
This online calculator converts a percent to a fraction. If the percent value is greater than 100% it is converted into a mixed number fraction. Enter percents to convert them into fractions. The number you enter can also have decimal...
Calculator Soup
Calculator Soup: Decimal to Percent Calculator
Convert decimals to percentages with this calculator. Input a decimal number to convert both the whole number and decimal part of the number to a percent value.
Calculator Soup
Calculator Soup: Fraction to Percent Calculator
Convert a fraction to a percent. Convert proper and improper fractions to percentages. This calculator shows the steps and work to convert a fraction to a percentage number.
National Council of Teachers of Mathematics
Nctm: Figure This: Majority Vote
Cast your vote for this math challenge that explores calculating percentages as it relates to voting. Discover how mastering this skill will be beneficial in real life situations. A one page activity from the NCTM Math Challenges for...
University of Cambridge
University of Cambridge: Nrich: The Magic Number and the Hepta Tree
Use your calculator to help you solve this challenge at this one page website. You can check your solution with only one click of the mouse.
Hopelink
Hopelink: Teaching Percentages
Students can brush up on percentage skills with this lesson and calculate percentages using the "Percent Tricks method." For students to successfully use this method, they must have the ability to multiply and divide whole numbers.
National Council of Teachers of Mathematics
Ntcm: Math Challenge: Perplexing Percentages
Test your bargin shopping skills by figuring out which discount offers the greatest savings. A one page activity from the NCTM Math Challenges for Families series that focuses on understanding and calculating percentages. Connections...
BBC
Bbc: Percentages
You can pick up some valuable percentage pointers on how to work with them. When you finish working your way through the pages, you can take an on-line "Test Bite" and check your understanding.
Math Is Fun
Math Is Fun: Compound Interest
Explains, with examples, what compound interest is and how to calculate it using a formula. Also shows how to work backwards to calculate the present value of an investment, how compound interest is calculated for different compounding...
Carnegie Mellon University
Chem Collective: Composition Determination of a Mixture
In this activity, students calculate the percent composition of a mixture of two arsenic-containing minerals. Step-by-step support and feedback is provided for students who need additional help.
McGraw Hill
Glencoe: Self Check Quizzes 1 Geometry Area of Rectangles
Use Glencoe's randomly generated self-checking quiz to test your knowledge of finding the area of rectangles. Each question has a "Hint" link to help. Choose the correct answer for each problem. At the bottom of the page click the "Check...
University of Nebraska
Carbon 14 Dating Calendar
Provides a Carbon 14 Dating Calculator to compute the percent of Carbon 14 remaining after a given number of years. Also calculates how many years have elapsed from how much Carbon 14 remains.
Illustrative Mathematics
Illustrative Mathematics: F Le Carbon 14 Dating, Variation 2
In this task on exponential decay, students calculate what the amount of Carbon 14 left in a preserved plant will be as time passes and when one microgram will be all that is left. Aligns with F-LE.A.1.c.